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- W790152282 abstract "The genus Helianthus is a comparatively large one, containing, according to Watson (13), 108 authentic and several doubtful species. These are arranged and classified by the taxonomist according to manifestations that are readily visible, but, if the chromosome number and the behavior during meiosis were known in each case, a better understanding could be gained of the interrelation of the species and greater accuracy might be possible in deciding whether a doubtful plant were a variety, a true species or a hybrid. Up to now, the chromosomes have been counted in two species. Boenicke (1) reported 16 as the haploid number for Helianthus annuus L. in his work on the pollen mother cells. Tahara (11), Prozina (8) and Makowetzky (5), each working at different times on somatic cells of Helianthus annuus L., all gave 34 as the diploid number, which by inference would make the haploid number 17. Makowetzky's (5) study of the chromosomes of Helianthus tuberosus shows the haploid number to be about 51. The present paper adds seven more species of Helianthus whose chromosome numbers have hitherto not been counted. Some work has also been done on a few of the other genera of the tribe Helianthea of the family Composita, to which the genus Helianthus belongs. Table I gives the results of all counts so far made in the tribe Helianthea." @default.
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- W790152282 date "1931-01-01" @default.
- W790152282 modified "2023-09-23" @default.
- W790152282 title "Chromosome Numbers in Certain Species of Helianthus" @default.
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